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k in (-oo:+oo)
4*(5*k-6) = -4 // + 4
4*(5*k-6)+4 = 0
4*(5*k-6)+4 = 0
20*k-20 = 0
20*k-20 = 0
20*k-20 = 0 // + 20
20*k = 20 // : 20
k = 20/20
k = 1
k = 1
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